Six Italian men were fatally shot in the head outside a train station in the western German city of Duisburg early Wednesday, police said. The six victims were found in two vehicles near the main train station. One of the men died while being taken by ambulance to a hospital, police spokesman Hermann-Josef Helmich said. All had gunshot wounds to the head, he said. Helmich said the men, between the ages of 16 and 39, were Italians, but gave no other information on their identities. Police did not know who might have committed the killings or what the motive might have been, he said. A pedestrian heard the shots and stopped a police patrol car that happened to be in the area, said another police spokesman, Reinhard Pape. Police found numerous gun cartridges at the crime scene - about 100 meters from the train station. The vehicles were parked in front of an Italian restaurant. "There must have been more than one person involved," Pape said. The shooting happened around 2 a.m., he said. About a half hour later, police officers found the two vehicles with the victims - a van registered in Duisburg, and a car registered in Pforzheim, in southwestern Germany. The victims appear to have been unarmed, Pape said.